A terminal device includes, a processor； and a memory which stores a plurality of instructions, which when executed by the processor, cause the processor to execute, obtaining information that indicates a state of an imaging unit when photographing a subject； determining whether an image photographed by the imaging unit includes blurriness due to shaking of the imaging unit based on the obtained information； and using an image determined as not including blurriness in the determining to detect a line of sight of the photographed subject.
